Cardium. 
MOLLUSCA. CARDIADiE. 
4m 
Linn. Syst. i. 1122. Penn. Brit. Zool. iv. 90. t. 1. f. 37* Bon. Brit. 
Shells, t. vi. Mont. Test. Brit. 77* Twrt. Biv. Brit. 180. t. xiii. f. 
7. — In sandy bays. 
Length nearly 4 inches; light in proportion to its size; ribs rather broad, 
depressed with a rough or winged middle line rising into lanceolate spines at 
the retral side and compressed tubercles at the opposite, the furrows trans- 
versely striated. The young of this shell is the Cardium ciliare of Linnaeus. 
43S. C. tuberculatum. — Shell tumid, ponderous, with 21 
ribs, the posterior ones tubercular, the anterior ones scaly, and, 
together with interstices, rough with wrinkled striae. 
Linn. Syst. i. 1122. Don. Brit. Shells, t. cvii. f. 2. Mont. Test. Brit. 
568. Turt. Biv. Brit. 181. — Western coast of England ; common in 
Paignton Sands, Torbay, at low spring tides. 
Shell nearly the size of the last. “ It is more solid and ponderous, of a 
more globular shape, and running in a nearly straight line on the cartilage 
side from the beaks ; the ribs are narrower, and the grooves are deeper, both 
marked with strong irregular transverse striae ; the cartilage side is clothed 
with’ rather sharp tubercles, which never extend into spines, and which, at 
the opposite side, form thick transverse, scale-like plates : the colour is of a 
deeper chesnut ; and the ribs on the inside extend only half way towards the 
beaks.”— Dr Turton. 
4)33. C. ecMnatum. — Tumid, thin, with 18 ribs, armed with 
numerous rMected spines. 
Pectunculus echinatus. List. An. Ang.<188. Conch, t. cccxxiv — C. ech. 
Linn. Sj^st. t. 1122. Penn. Brit. Zool. iv. 90. Mont. Test. Brit. 78. 
Don. Brit. Shells, t. cvii. f. 1. Turt. Biv. Brit. 183. — Sandy bays. 
Less than the two preceding species, and more generally covered with 
jspines • these on the anterior side are large, and curved towards the cartilage 
side. 
We have given separate stations to these three reputed species, in de- 
ference to the authority of preceding authors, rather than from a conviction 
that they are distinct. Indeed, judging from specimens, given us by Mon- 
tagu and Dr Leach, and found more by ourselves, we can perceive that 
none of the characters on which the distinctions are founded can be relied 
on. The ribs vary from 16 to 21, from nearly smooth to coarsely wrinkled, 
and the spines from sharp pointed and recurved, to broad and blunt or tu- 
bercular. 
434<. C. muricatum.-—^\i^\ elongate, slightly compressed; 
ribs 37, with numerous lateral tubercles. 
Pectunculus tenuis. List. Conch, t. cccxxii — Cardium mur. Linn. Syst. 
i. 1123. 
A specimen of this shell, which I owe to the kindness of my friend Dr 
Coldstream, and which was found by him at Leith, is upwards of an inch 
and two-tenths in length, and about a tenth less in breadth ; whitish, tinged 
with yellow, and blotched with brown ; the ribs are rounded, and the tuber- 
cles, especially in the middle of the shell, are seated on the retral sides ; those 
anteally are short, blunt, and on some of the ribs double, the retral ones are 
more prominent ; the edge is strong and serrated ; the inside has a yellow 
stripe from the beak, bordered on each side by a brown one ; the retral side 
is brown and opake. We are disposed to consider tlie C. nodosum of Monta- 
gu and Turton as this shell in a young state. 
